Curcumin
Curcumin is the main color found in the root of the turmeric plant Curcuma longa, grown in south asia.
Ground turmeric rhizome is one of the main ingredients in curry powder. The bright yellow color has been used as a substitute for the expensive herb saffron.
Because turmeric fades with exposure to light, other colors are used if a product must be displayed in a clear container.